08-21-2007, 06:46 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
An open system draws fresh air straight from the atmosphere while a closed system pulls air from the air cleaner or one of the lines to the air cleaner. The closed system is more "green" in that if your crankcase pressure builds up the fumes will be forced back in to the intake system rather than just "leak" out.
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